New test case

diff --git a/tests/distributed_grids/create_torus_mesh.cc b/tests/distributed_grids/create_torus_mesh.cc
new file mode 100644 (file)
index 0000000..c84f0a7
--- /dev/null
+++ b/tests/distributed_grids/create_torus_mesh.cc
@@ -0,0 +1,59 @@
+// ---------------------------------------------------------------------
+//
+// Copyright (C) 2023 - 2023 by the deal.II authors
+//
+// This file is part of the deal.II library.
+//
+// The deal.II library is free software; you can use it, redistribute
+// it, and/or modify it under the terms of the GNU Lesser General
+// Public License as published by the Free Software Foundation; either
+// version 2.1 of the License, or (at your option) any later version.
+// The full text of the license can be found in the file LICENSE.md at
+// the top level directory of deal.II.
+//
+// ---------------------------------------------------------------------
+
+
+
+// Test GridGenerator::torus, which used to run into an assertion with p4est
+// due to bad orientations before 2023, see
+// https://github.com/dealii/dealii/issues/16272
+
+#include <deal.II/distributed/tria.h>
+
+#include <deal.II/grid/grid_generator.h>
+
+#include "../tests.h"
+
+
+int
+main(int argc, char *argv[])
+{
+  Utilities::MPI::MPI_InitFinalize mpi_initialization(argc, argv, 1);
+
+  initlog();
+
+  // create mesh
+  const int dim = 3;
+
+  parallel::distributed::Triangulation<dim> triangulation(
+    MPI_COMM_WORLD,
+    typename Triangulation<dim>::MeshSmoothing(
+      Triangulation<dim>::smoothing_on_refinement |
+      Triangulation<dim>::smoothing_on_coarsening));
+
+  const double       R                = 2.;
+  const double       r                = 1.;
+  const unsigned int n_cells_toroidal = 1;
+  const double       phi              = 0.5 * dealii::numbers::PI;
+  dealii::GridGenerator::torus<dim, dim>(
+    triangulation, R, r, n_cells_toroidal, phi);
+  triangulation.reset_all_manifolds();
+  triangulation.refine_global(1);
+
+  deallog << "Tria info: " << triangulation.n_vertices() << " "
+          << triangulation.n_cells() << " " << triangulation.n_faces() << " "
+          << triangulation.n_raw_lines() << std::endl;
+
+  return 0;
+}

diff --git a/tests/distributed_grids/create_torus_mesh.output b/tests/distributed_grids/create_torus_mesh.output
new file mode 100644 (file)
index 0000000..3cd4c02
--- /dev/null
+++ b/tests/distributed_grids/create_torus_mesh.output
@@ -0,0 +1,2 @@
+
+DEAL::Tria info: 75 45 170 214